| 单词 | Friedmann model |
| 释义 | Friedmann model /freed"meuhn/, Astron. any model of the universe deduced from a homogeneous, isotropic solution of Einstein's field equations without a cosmological constant. Such models form the mathematical basis for many modern cosmologies and provide for expansion or contraction of the universe. Also called Friedmann universe. [named after Alexander Friedmann, (1885-1925), Russian mathematician, who made the necessary calculations in 1922] |
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